Abstract
A field experiment was carried out to study the effect of: (1) the cultivation of a cereal (pearl millet) and two legumes (mung bean and clusterbean), and (2) incorporation of crop residues and manure in soil, on depletion or enrichment of pools of amino acid-N and amino sugar-N in soil. Both legumes enriched amino acid and amino sugar fractions but pearl millet cultivation depleted them. Enrichment of these fractions was partly attributed to the conversion of N biologically fixed during legume cultivation to these fractions and partly to the conversion of unknown and non-hydrolysable N fractions to amino acid-N and amino sugar-N. Mineralization of amino acid-N and amino sugar-N fractions along with their conversion to unknown and non-hydrolysable fractions were the plausible reasons for the decline in their concentrations after pearl millet cultivation. Application of residues or manure reversed this effect of pearl millet.
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